Marine reverse gear



July 25, 1933. G. A. WOOD ,9

MARINE REVERSE GEAR Filed Sept. 17, 1928 A Fr 5 1m" T'ml I Q) 5 Illl \noQnTor Patented July 25, 1933 UNITED STATES P TENT OFFICE GARFIELD A. woon, or DETROIT; M oHIeAn MARINE REVERSE GEAR,

Application filed September 17, 1928. Serial No. 306,523.

This invention relates to a reverse gearing Construction particularly designed and adapted for use with marine engines for" reversal of the propeller when desired. The h reversal is commonly accomplished by gripping a band upon a rotating drum. drum and band are enclosed within a housing or casing and are immersed in oil to a greater or less extent, and it is very desirable when the band is gripped upon the drum that theoil between the band and drumsliall be removed very quickly and rapidly in F ig. 1 is a transverse section through the housing of the drum and band, which areshown in end elevation.

Fig. 2 is a fragmentary longitudinal sec- 25 tion through the housing, the drum and band being shown in side elevation with partsof the band broken away.

Fig. 3 is a vertical longitudinal section through the band and Fig. 4 is a side ele- Vation of the drum as it is made in accordance with my invention. v a

Like reference characters refer to like parts in the different figures of the drawing{ The housing or casing in which the ,re

35 verse drum and'band are located is .indicated at. 1 and is supplied with an upper detachable cover or top 2. A horizontal shaft 3 extends through} the housing on which the drum-- l is mounted. Lugs 5 extend inwardly from opposite sides of the housing 1 and the band 6, located around .the drum, is equipped with opposite side lugs 7 to bear against the upper sides of the lugs 5, as shown in Fig. 1. The band is parted at its upper side and at each side of the parting is provided with an upwardly extending lug 8. Between the lugs a coiled'compression spring 9 is located around a rod 10 which passes through the The andnovel means for accomplishing. the end lugs,'the ofiice of the spring being normally to spread thelugs so as to free'the,

band from any engagement 'withithe drum. The rod IOQeXtends through sleeves 11 and '12 located inside the housing 1,, the,

sleeve 11 abutting at its respective ends againstthe inner s1de of the hous ng and against o'ne'of the lugs 8 and the sleeve 19. abutting at its iner end aga nst the other lug 8 and extending. through an opening in the housing to the exterior thereof; Nuts are provided on the end of the. rodv .10"

adjacent withand engaging the outer end of thesleeve 12 andan operating lever 13 is provided at the opposite outer end of the rod '10-"whereby the rod may be moved es longitudinally to clamp the band around. i

the drum 4-. In "this action longitudinal movement of ithe rod in a direction toward its end with which the lever 13 is connected slides the sleeve 12 and moves the lug 8 which is engaged by the sleeve 12 but the opposite lug 8 engaged. by the sleeve 11 is held from'movement because the sleeve 11 abuts against thehousing 1 and thus the lugs are moved toward each other compressing the spring 10 andclamping the band 6 upon the drum 4.

The construction so far as described is well known and'conventionah i In my invention the nner side. of the band is-provided with. spiral-grooves 1 1 which, except for the parting of, the band at the upper side, would form a continuous helical groove from one end of the band to the other at the inner side thereof. The grooves in practice are shallow in depth,

substantially onesixteenth of an inch, and i are relatively narrow in width, in practice one eighth of an inch, -while the-distance between. centers of grooves in practice is one half an inch. It vis, of course, to be understood that these dimensions may be varied.

A plurality of small openings '15 are made through the band, the inner ends thereof joining the grooves 14. Saidopenlngs preferably are in a spiral line around the inner side of the band, saidspiral crossing the grooves 14:, as best shown in F1gs..2 and 3. The drum 4 is provided with a similar spiral groove 16 around it substantially from one end thereof to the other, or at least all of the length thereof or somewhat more than is covered by the band 6. This groove is cut in a direction opposite to the grooves 14: so that the grooves cross each other when the band is appliedto the drum. m

With the construction as described, when the band is tightened against the drum, any oil between the band and drum is transferred to the grooves immediately and passes outwardly through the openings 15 whereby a secure gripping of the band against the drum takes place almost immediately and there is insurance against slippage between the drum and band. If

the band and the drum are positioned relafactured and is durable and efiicient in service. The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim: I

1. A construction of the class described comprising, a rotatably mounted shaft, a drum'on said shaft having a spiral groove around the same, and a gripping band located around the drum having spiral grooves cut therein at its inner side, the grooves on the band crossing the grooves in the drum for the purposes described.

2. In combination with a rotatable shaft, a-druin mounted on sald shaft, said drum having a continuous spiral groove around the same at its outer side and lengthwise thereof, a gripping band having a parting at one side located around the drum, said band at its inner side having spiral grooves therein in a direction reverse to the grooves on said drum whereby said grooves on the drum and band cross each other, and means for This construction moving the ends of said band at the parting therein toward each other to grip the band on the drum.

3. A construction containing the elements in combination defined in claim 2, said band having a plurality. of openings therein extended from its outer sides to the grooves at the inner side of the band.

A construction of the class described adapted for use in a reverse gearing, comprising a drum having spaced grooves therein around it, said grooves being in. planes inclined to the horizontal axis of the drum, a gripping band around said drum having spacedagrooves at its inner side also inclined to the axis of said drum in a direction opposite to the inclination, of the grooves in said drum whereby the grooves in said drum and band cross each other.

5. A construction containing the elements lDCOlllbilliLillOll defined in claim l, said band having a pluralityof spaced apart openings therein extending from its outer side to said grooves, the openings through the band being spaced apart both horizontally and vertically.

construction of the class described comprising, a rotatable drum having a spiral groove around the same and a gripping contractible band, located around the drum, having grooves on its inner surface, the grooves on the drumcrossing the grooves on the band whereby access therebetween is maintained at all times.

7. A construction of the class described comprising a rotatably mounted drum, a gripping band located around the drum, said band having grooves cut therein at its inner side, a plurality of small openings extending outwardly from the grooves, said openings extending entirely through said band and depressed portions on the drum whereby a conduit is had between the grooves on the band. i

S. A construction of the class described adapted for use in a reverse gearing, comprising a drum having spaced grooves therein around it, a gripping band. around said drum having grooves at its inner side, said grooves being located angularly to each other whereby they cross, said gripping band having a plurality of openings leading from the grooves therein.

GARFIELD A. WOOD. 

